Know which equipment burns fuel
Electric air conditioning does not burn fuel as part of its cooling cycle. A home may also contain a furnace, water heater, or other combustion appliance. Do not assume that an alarm is unrelated simply because cooling is running.
Respond to alarms first
If a carbon monoxide alarm sounds or you smell gas, leave the building and contact emergency services or the gas utility from outside. Do not stay inside looking for the HVAC cause.
Refrigerants need qualified handling
The equipment’s refrigerant is not a household maintenance material. Leave leak detection, recovery, charging, and internal circuit work to qualified professionals. Do not mix refrigerants or use an unknown substitute.
Keep systems intact
Do not bypass interlocks, obstruct venting, or alter fuel and electrical connections. Tell the service provider about any recent building or equipment work that could affect the system.
Include every fuel-burning appliance in the safety picture
EPA identifies furnaces, water heaters, fireplaces, generators and other combustion sources as potential carbon-monoxide concerns. Carbon monoxide cannot be reliably detected by smell. A concern in the house should not be dismissed because the central air conditioner itself is electric.
Arrange qualified care for fuel-burning appliances and follow the alarm manufacturer’s instructions. Keep an appliance list so a service provider understands what is in the home. During an alarm or suspected gas emergency, leave first and contact emergency services or the utility from outside; the list is for later assessment, not a reason to remain inside.
- Identify the heating equipment and any other fuel-burning appliances.
- Keep venting and appliance maintenance records available.
- Report recent building or exhaust-system changes to the service provider.
- Never operate a portable generator inside a home, garage or similar enclosed space.
- Do not use an air cleaner or normal HVAC operation as a response to a CO alarm.
General homeowner information from S&S HVAC. Equipment instructions and the approved project scope govern work on your system. Source links support the guidance; they do not imply a manufacturer endorsement.